The Three-Level Event Building System for the Belle II Experiment

Author

Suzuki, S.Y. ; Yamada, S. ; Itoh, R. ; Nakao, M. ; Konno, T. ; Higuchi, T. ; Nakamura, K.

Author_Institution

Comput. Res. Center, KEK, Tsukuba, Japan

Volume

62

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1162

Lastpage

1168

Abstract

Belle II, an experiment designed to search for physics beyond the standard model in the decay of B mesons, will soon start operation at the Super KEKB e⁺ e^- collider. The trigger rate is expected to be 30 kHz with a margin of 10 kHz, and the raw data rate will exceed 30 GB/s. Since the system will be unable to record all data on its storage system, online reduction is required. We have developed a three-level event building system using inexpensive switches and software for traffic smoothing, enabling online event processing at a reasonable cost. The data will be recorded on the storage system about 3 GB/s after rate reduction. This paper describes the architecture and the verification result in actual beam tests.

Keywords

B mesons; data acquisition; high energy physics instrumentation computing; meson decay; models beyond standard model; B meson decay; Belle II experiment; Super KEKB positron-electron collider; actual beam tests; inexpensive switches; online event processing; online reduction; physics beyond standard model; rate reduction; storage system; three-level event building system; traffic smoothing; Bandwidth; Copper; Data acquisition; Optical switches; Receivers; Sockets; Throughput; Data acquisition; event building;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2015.2422376

Filename

7100951